Hey my SVT did the same thing turns out it was actually the alternator, they replaced the computer, gauge cluster, and speed sensor, to finally figure out the alternator was the culprit.

just a thought for ya,
joe


1999 Contour SVT ~ Black w/Tan Current Mods: Fog light rewire, 20% Tint, SVT Banner,Rockford Fosgate RFX-8340, 2-12" Bostwick SPL Subs & Audiobahn 600x2 Future Mods: Knauberizing it, lowering